DRV8889-Q1EVM: Motor Control using GUI

Arshiya Tabassum

Part Number: DRV8889-Q1EVM

Hi,

I am working with DRV8889-Q1EVM and a stepper motor by Portescape whose current rating is 550mA, voltage is 12V.

When I drive the motor in "Step Mode", it works fine but in "Speed Mode" there seems to be an issue. It starts fine, rotates until the target speed (500pps or 1000pps changed in GUI) after this, it stops rotating but I can hear the sound of the motor. After this, I click "Stop Steps" and it rotates and comes to stop according to Stop Speed specified.

I don't know what is causing the issue, I am driving the motor at a voltage of 12V and current of 400mA currently.

Thank you,

Arshya Tabassum

over 3 years ago

0 Rick Duncan over 3 years ago

TI__Guru** 114905 points

Hi Arshiya,

Can you provide some additional information when using speed mode, such as:

The target speed

starting speed

stopping speed

acceleration rate

step mode

My guess at this point is that the motor is either exceeding the maximum speed or accelerating too quickly. This happens most frequently if the step mode is full step.

0 Arshiya Tabassum over 3 years ago in reply to Rick Duncan

Intellectual 975 points

Details:

But its behaving the same way in 1/8 step mode as well.

0 Rick Duncan over 3 years ago in reply to Arshiya Tabassum

TI__Guru** 114905 points

Hi Arshiya,

Is it possible to send a video of the motor running and stalling? If necessary, we can make arrangements to send it privately.

Please also include the initial target speed and the new target speed that caused the motor to stall (stop rotating).

0 Arshiya Tabassum over 3 years ago in reply to Rick Duncan

Intellectual 975 points

Hi Rick,

I can send you the video, please let me know how I can do that.

And the initial speed is 200pps and target speed was 1000 by default, I changed I to 500. Also, is there a way to check the speed at which it is stalling?

Thank you,

Arshiya Tabassum

0 Rick Duncan over 3 years ago in reply to Arshiya Tabassum

TI__Guru** 114905 points

Hi Arshiya,

We will make arrangements to receive the video. Look for a message shortly.

Based on your description, it is recommended to change from 1000 to 750. If the motor continues to run then try 625. Basically you are performing a binary search to determine the stall speed.

By the way, I was expecting the speed to be increased when the stall occurred. Typically we do not see stalls when the speed is decreased.

0 Rick Duncan over 3 years ago in reply to Rick Duncan

TI__Guru** 114905 points

Hi Arshiya,

Have you made any progress? Do you have any additional questions?

0 Arshiya Tabassum over 3 years ago in reply to Rick Duncan

Intellectual 975 points

I haven't heard back from the TI RTOS team.

0 Rick Duncan over 3 years ago in reply to Arshiya Tabassum

TI__Guru** 114905 points

Hi Arshiya,

We have contacted the team directly, and were told to expect a reply today.

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DRV8889-Q1EVM: Motor Control using GUI